Electronic access control (EAC) systems are often installed at the doors or gates of buildings as part of an overall physical security program. EAC acts as a digital checkpoint, selectively restricting entry to a building or zone only to authorized individuals, therefore adding a critical layer of protection for the people and assets inside. The level of access a person has will vary depending on their security status, or depending on the location they are attempting to enter. EAC will also regulate the times and conditions within which access is allowed.